Guy did not invent secular evangelism, but he popularized it. This goes back to 1983 and his work with the Macintosh Division of Apple. He is currently the chief evangelist of Canva, an online, graphics-design company from Australia.

Guy is the author of thirteen books. These books are textbooks for the finest academic institutions in the world and have been both New York Times and Wall Street Journal bestsellers. His writing focuses on the tactical and practical in order to empower and inspire.

Guy gives over fifty keynote speeches per year. His clients include Apple, Nike, Gartner, Audi, Google, Microsoft, and Breitling as well as dozens of trade associations. His topics include innovation, enchantment, social media, evangelism, and entrepreneurship.